![]() As shown in Figure 3, the results table shows a sample size of 362 participants corresponding with a 95% confidence level. Therefore, the sample size calculation required for this study will be 362 patients (181 patients per group). Finally, submit the data and check the table for the calculation results. The sample size was calculated through the StatCalc EPI-INFO software version 6.0. Linkage disequilibrium was determined for associated alleles. It is used by researchers who prefer as well as have the resources to analyze their data with software. Relative risk and P-values were determined for each allele using Statcalc (EpiInfo, Version 6). Then, select “unmatched case-control studies” ( Figure 2). StatCalc is one of the most useful parts of Epi-Info. Cálculo de la muestra para estudios de prevalencia con Epi Info Marco Antonio Zavala-González 23 subscribers Subscribe 63 Share 2.8K views 3 years ago Puedes descargar Epi Info versión 7 desde. Download the Epi Info 7 User Guide for Word Word 46.5 MB Download the Epi Info 7 User Guide for PDF PDF 26.2 MB Chapter 1: Introduction PDF 361 KB Chapter 2: Form Designer PDF 5.68 MB Chapter 3: Check Code PDF 1. The following steps will show how to calculate the sample size for a case-control study in order to detect a similar odds ratio with 90% statistical power and a 5% margin of error.Ĭalculations will be done by the Epi Info, a program developed by the Centers for Disease Control and Prevention available via the link: First, open the software then select “STATCALC” for sample size calculation options ( Figure 1). A printable version of the Epi Info 7 User Guide is available for download in both Word and PDF formats. Epi Info has been in existence for over 20 years and is currently available for Microsoft Windows, Android and iOS, along with a web and cloud version. showed that the odds ratio of association between exposure to HCV infection and developing OLP was 9.7 with a 1/101 prevalence rate of HCV among the control group (healthy population) ( 3). Epi Info is statistical software for epidemiology developed by Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia (US). ![]() Therefore, we will identify two groups from the population (cases: patients with OLP and control group: subjects without OLP).Ī previous study by Manomaivat et al. ![]() Ī printable version of the Epi Info 7 User Guide is available for download in both Word and PDF formats.EXAMPLE: A CASE-CONTROL STUDY ABOUT THE ASSOCIATION BETWEEN HCV INFECTION AND ORAL LICHEN PLANUSĪssume that we will conduct a case-control study to investigate the association between HCV infection and Oral Lichen Planus (OLP). EpiInfo Version 6 Statcalc November 1993 Analysis For Linear Trend In Proportions Chi Square for Exposure linear trend : 3.535 Score Odds Ratio p value : 0.06010 1.00 1.00 2.00 0.92 3.00 0.91 4.00 1.42 5.00 1.57 Under the null hypothesis, the chi-square statistic has a chi-square distribution with 1 degree of freedom. Diabetes mellitus (DM) is a metabolic disorder with major worldwide impact. ![]() It enables physicians, epidemiologists, and other public health and medical officials to rapidly develop a questionnaire or form, customize the data entry process, and enter and analyze data.Įpi Info 7 is free of charge and can be downloaded from the CDC website at. (2023) 6(2), 4143 Patients of Type 2 Diabetes Mellitus. Epi Info™ is a series of freely-distributable tools and utilities for Microsoft Windows for use by public health professionals to conduct outbreak investigations, manage databases for public health surveillance and other tasks, and general database and statistics applications. ![]()
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